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Old 05-12-2012, 10:38 AM   #1
DDScooby
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Default JDM Version 4 gearbox swap into 02 WRX part guide?

Sigh...ok searching hasn't turned up much help so I'm asking the guys that have been around the block.

I found a decently priced JDM Ver. 4 STi gearbox (4.444) TY752VBCAA. Want to get this swapped into my 02 WRX (all stock drive line at this point) I would like to keep the R160 rear diff and really swap out as little as possible; however, I haven't the slightest clue about anything older than Ver 7 Subarus. If some one can provide a comprehensive list, link to one, a person to get in contact with, or just general guidance it would really be a great help.

I looked at just doing a simple 06/07 gearbox swap since that seems to be "easiest" ( say that with a relative tongue in cheek cause no swap is ever easy), but my gut tells me that the JDM V4 gearbox w/a 5MT is going to less cumbersome banging through gears and just more "fun" in general. Also finding an 06/07 tranny below $2500 isn't very realistic.

Thanx in advance to anyone with some guidace!
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Old 05-12-2012, 12:52 PM   #2
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Get a matching 4.44 rear diff.
Swap the WRX speed sensor into the other gear box (if they are even different).
Swap the reverse and nuetral switchs (if different).
Replace the adapter on the shift rod with the WRX one.
The V4 will only use 4 (of the WRX's 8) engine-to-tranny mounting bolts. But it all still bolts up.
They use the same flywheel and clutch kit.

That's all I can think of. (outside of DCCD integration, but you didn't say anything about it)
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Old 05-12-2012, 01:10 PM   #3
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Quote:
Originally Posted by RallyColtTurbo View Post
Get a matching 4.44 rear diff.
Swap the WRX speed sensor into the other gear box (if they are even different).
Swap the reverse and nuetral switchs (if different).
Replace the adapter on the shift rod with the WRX one.
The V4 will only use 4 (of the WRX's 8) engine-to-tranny mounting bolts. But it all still bolts up.
They use the same flywheel and clutch kit.

That's all I can think of. (outside of DCCD integration, but you didn't say anything about it)
Rear Diff- located -Can I use ANY subaru 4.44 rear end, or does it have to specifically be for the Ver. 4 STi? I'm assuming any 4.44 rear end will do.

Axles? can just reuse the 02 WRX axles no problem? I would assume so..but I want to be sure so I'm not left hangin my head like a goober w/an axle that won't fit lol WRX--->Ver. 4 box

DCCD is covered (DCCDPro.com)

Driveshaft is a direct swap over as well? WRX--->Ver. 4 box/dif

Shift linkage? direct swap? WRX--->Ver. 4 box

...this seems to good to be true LOL

Thank you for the help man, I really appreciate it!

Last edited by DDScooby; 05-12-2012 at 02:18 PM.
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Old 05-12-2012, 06:21 PM   #4
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I just bought a Ver. 4 JDM STi gearbox and a '01 JDM STi R160 LSD 4.44 rear end.
Ratios as follows:
(3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 4.444FD)

Grand total came out to ~$1560 shipped for both items. I just want as many eyes on this as possible to see what else I might need or if I just screwed myself.

Thanx guys/gals

Last edited by DDScooby; 05-12-2012 at 06:31 PM.
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Old 05-12-2012, 06:21 PM   #5
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this swap should take a few hours longer that a clutch job...

everything should bolt right up. the front axles will fit. the rear should also (?). drive shaft will fit. shift linkage may be slightly different. but will work with little modification.

-=Suberdave=-
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Old 05-12-2012, 06:29 PM   #6
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Originally Posted by suberdave View Post
this swap should take a few hours longer that a clutch job...

everything should bolt right up. the front axles will fit. the rear should also (?). drive shaft will fit. shift linkage may be slightly different. but will work with little modification.

-=Suberdave=-

Thanks for the roger up and expertise man.
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Old 05-12-2012, 07:44 PM   #7
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hmmm part number is: TY752VBCAA looks to be a viscous center diff. So no DCCD. saved some money.
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Old 05-13-2012, 05:54 AM   #8
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Quote:
Originally Posted by DDScooby View Post
hmmm part number is: TY752VBCAA looks to be a viscous center diff. So no DCCD. saved some money.
But lost some fun unfortunately, i just did a Vers 4 RA swap with dccd and let me tell you breaking tires loose through third is a pretty irreplaceable feeling
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Old 05-13-2012, 09:40 AM   #9
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But lost some fun unfortunately, i just did a Vers 4 RA swap with dccd and let me tell you breaking tires loose through third is a pretty irreplaceable feeling
Thats awesome man! I just look at it as something I can't miss if I never had. lol

like the V4 gear box? obviously (dumb question)
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Old 05-13-2012, 11:45 AM   #10
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Quote:
Originally Posted by DDScooby

Thats awesome man! I just look at it as something I can't miss if I never had. lol

like the V4 gear box? obviously (dumb question)
Ya RA has diff gears than yours but you will like it all the same
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Old 05-13-2012, 12:05 PM   #11
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Quote:
Originally Posted by Patty_McFly View Post
Ya RA has diff gears than yours but you will like it all the same
There really isn't too much difference in gear spacing, just stronger, which is essentially what I was looking for.

Plan is to keep the old 5MT strip it down, put it back together, strip it down again...etc -Learning experience. Then someday maybe throw in a set of Albins or STi RA gears...dunno we'll see
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Old 05-13-2012, 03:46 PM   #12
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As far as the shifter....

If you take the piece on the shift rod that sticks out of the back of your WRX tranny and put it on your V4 tranny, the stock WRX shifter will bolt up. It's held in with a roll pin - actually two, a roll pin IN a roll pin. Do it when the trannies are on the ground, because it's a bitch to do in the car.
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Old 05-13-2012, 04:35 PM   #13
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Quote:
Originally Posted by RallyColtTurbo View Post
As far as the shifter....

If you take the piece on the shift rod that sticks out of the back of your WRX tranny and put it on your V4 tranny, the stock WRX shifter will bolt up. It's held in with a roll pin - actually two, a roll pin IN a roll pin. Do it when the trannies are on the ground, because it's a bitch to do in the car.

I remember seeing those when I did the Kartboy SS/bushing install...yes it is a pain to work on that with it bolted into the car.

Thanks man, writing stuff down in a notebook!!

Any other tips!?
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Old 05-13-2012, 04:46 PM   #14
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Quote:
Originally Posted by RallyColtTurbo View Post
The V4 will only use 4 (of the WRX's 8) engine-to-tranny mounting bolts. But it all still bolts up.



I have a Hybrid built motor (205/257) still same info for bolting the tranny to the block?

EDIT: nvm, found the answer.

Last edited by DDScooby; 05-13-2012 at 04:55 PM.
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Old 05-13-2012, 05:03 PM   #15
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Just as a heads up when I repaired the reverse gear in my 6 speed that shift attachment's roll pins went in and out from only one direction and each one was the opposite direction from the other. So if they aren't budging go to the other side. I know it sounds confusing but it should be easy to figure out when you do it.
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Old 05-13-2012, 09:07 PM   #16
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I built a gearbox using the jdm ver 6 STi RA gears. I bought the gears assembled on the two shafts for 650 shipped with 30k miles on them. Then I found a blown up 03 wrx tranny for 150$ I gave the gears and transmission to my builder. He opened up the stock 03 wrx gear box, cleaned it up and reassembled it with the RA gears. he reused the pinion shaft from the 03 wrx gearset to keep the 3.9 final drive. All said and done i spend $1000 to build it. I also kept my r160 rear diff. You can do the same as long as you have all the correct differentials and the final drives match up. Of course I lucked out because the synchros on the blown gearset were like brand new so we resused those and the only other thing was a shim and gasket kit that i purchased for reassembly.
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Old 05-13-2012, 09:18 PM   #17
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Quote:
Originally Posted by RallyColtTurbo View Post
Get a matching 4.44 rear diff.
Swap the WRX speed sensor into the other gear box (if they are even different).
Swap the reverse and nuetral switchs (if different).
Replace the adapter on the shift rod with the WRX one.
The V4 will only use 4 (of the WRX's 8) engine-to-tranny mounting bolts. But it all still bolts up.
They use the same flywheel and clutch kit.

That's all I can think of. (outside of DCCD integration, but you didn't say anything about it)
Why not make it easier....just swap gears right into his current WRX gearbox? See my post above....provided he still has it!

3.083 / 2.062 / 1.545 / 1.151 / 0.825 or OEM - JDM GC8 WRX/STi RA Version 3-6

Looks like your ver 4 is the same as my ver 6? If thats correct, then I wanted to mention using these ratios with a 3.9 FD IMO is short enough...at least for my use. I cant imagine a 4.44 as youd be shifting quite a bit and your highway cruising speed would be really high. I cruise at 3500 rpm I think at 70 mph....stock wrx 5th gear is like 2800 rpm at 70 mph i think.

You can see your speeds using a gear ratio / speed calculator:
http://www.car-videos.net/tools/speedrpm.asp
http://www.teammfactory.com/gearcalculator.php
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Old 05-13-2012, 09:23 PM   #18
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Quote:
Originally Posted by BlackJavaPearl04 View Post
I built a gearbox using the jdm ver 6 STi RA gears. I bought the gears assembled on the two shafts for 650 shipped with 30k miles on them. Then I found a blown up 03 wrx tranny for 150$ I gave the gears and transmission to my builder. He opened up the stock 03 wrx gear box, cleaned it up and reassembled it with the RA gears. he reused the pinion shaft from the 03 wrx gearset to keep the 3.9 final drive. All said and done i spend $1000 to build it. I also kept my r160 rear diff. You can do the same as long as you have all the correct differentials and the final drives match up. Of course I lucked out because the synchros on the blown gearset were like brand new so we resused those and the only other thing was a shim and gasket kit that i purchased for reassembly.


Why not make it easier....just swap gears right into his current WRX gearbox? See my post above....provided he still has it!

3.083 / 2.062 / 1.545 / 1.151 / 0.825 or OEM - JDM GC8 WRX/STi RA Version 3-6

Looks like your ver 4 is the same as my ver 6? If thats correct, then I wanted to mention using these ratios with a 3.9 FD IMO is short enough...at least for my use. I cant imagine a 4.44 as youd be shifting quite a bit and your highway cruising speed would be really high. I cruise at 3500 rpm I think at 70 mph....stock wrx 5th gear is like 2800 rpm at 70 mph i think.

You can see your speeds using a gear ratio / speed calculator:
http://www.car-videos.net/tools/speedrpm.asp
http://www.teammfactory.com/gearcalculator.php
Thats a damn good score man!! I'll probably do something similar with my old 5MT. The box I found was only $600 (the shipping sucks @$604) and 4.444 rear end to go with it was only $249.

I like the idea of transferring them from one box to the other, however, more work than it might be worth to keep the 3.90 rear end. I used the same Mfactory gear ratio/speed calculator and I watched a few videos on the gearbox I just ordered. I have to say I like more grunt in a gear set and the 3.9 are just too long, albeit great for a time attack. My driving style suits the 4.44 rear end with those gear ratios, I don't do really much driving any longer being in school, and the bit that I do is mostly city driving (going to kill that 17mpg I have -oh well). The few times I do make long cruises I lock the cruise @ ~65-70. I average about 25-26mpg now. The difference is fairly nominal, in my opinion. What little I do suffer will be ok...If I end up shifting like a mad man, then I'll definitely be hitting you up for more info on the steps you took in your build. It's an experience to say the least lol.

Last edited by DDScooby; 05-13-2012 at 09:40 PM.
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Old 05-13-2012, 11:43 PM   #19
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another question: Is there really any major difference between say a USDM STi intake manifold and the WRX? -Other than the color.
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Old 05-14-2012, 08:05 PM   #20
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IIRC I dont think there is?
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Old 05-14-2012, 08:14 PM   #21
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IIRC I dont think there is?
there isn't...except the throttle body. same ID as the WRX one.
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Old 05-15-2012, 11:21 AM   #22
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splitting the case and swaping gears .. easier? what?
if he is replacing the 3.90 (guessing munched gears) there is a good chance he had case flex too

its 5 min with a wrench set to move over the bits. iirc both the 97 and 98 have the updated linkage so you may not have to change it but may want to as they are easy damaged in shipping

if you wanted gas mileage go buy a justy

the 3.90 was put in the usdm cars for gas mileage .. it goes in the pile of compromises that SOA made when the wrx first came to the US (add rear sway bar,spring rates,rim size,and seats to the list)

there is one more thing you may have to change, the input flange on the rear diff. you may have to swap it over from you existing setup, its a bolt on/off affair .. hopefully you have air tools and can zip it right off


one drive with the 4.44 and you will never want to go back

fwiw its 3200 rpm at 70

edit: just had a thought did you get the rear axels with the rear diff .. some of the older plated diffs have a very different dual spline axle on the lh side


edit 2: those are the wrong rations and don't confuse sti with stiRA there are no rules with the v2-v4 RAs they were all built to order custom
correct ratios:
TY752VBCAA 3.166 1.882 1.296 0.972 0.738 4.444

Last edited by Jaxx; 05-15-2012 at 11:38 AM.
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Old 05-15-2012, 11:35 AM   #23
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Quote:
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splitting the case and swaping gears .. easier? what?
if he is replacing the 3.90 (guessing munched gears) there is a good chance he had case flex too

its 5 min with a wrench set to move over the bits. iirc both the 97 and 98 have the updated linkage so you may not have to change it but may want to as they are easy damaged in shipping

if you wanted gas mileage go buy a justy

the 3.90 was put in the usdm cars for gas mileage .. it goes in the pile of compromises that SOA made when the wrx first came to the US (add rear sway bar,spring rates,rim size,and seats to the list)

there is one more thing you may have to change, the input flange on the rear diff. you may have to swap it over from you existing setup, its a bolt on/off affair .. hopefully you have air tools and can zip it right off


one drive with the 4.44 and you will never want to go back

fwiw its 3200 rpm at 70

edit: just had a thought did you get the rear axels with the rear diff .. some of the older plated diffs have a very different dual spline axle on the lh side
I should have updated this; a buddy of mine that races ST class and AutoX, has gone through 19 JDM PAR 5MT, PPG, Modena builds, yes NINETEEN, basically came over to my house and wouldn't leave till I gave up the idea of a 5MT. Said I was a stupid idiot for even considering it. Reasons you just mentioned, fuel economy, and the 4.44 rear end is a stupid idea for people that don't race, meaning me. Might be a matter of opinion as far as the stupidity goes, but really for me it was stupid. lol There were a few other <expletives deleted> thrown in there and a laundry list of things that were just more common sense to spend the extra $$ for a daily-driver 6spd and 330-380ft/lbs of torque.

So, the idea was ****canned. I found a JDM 04 6spd STi set up that is going to work much better. And last longer. I can rattle off specs and engine do's vs. don'ts; however, drive line mojo isn't my thing and am learning as I go. Therefore, defaulting to those with more experience.
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Old 05-20-2012, 08:45 PM   #24
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With the ratios I listed, which is what 'Im running with a 3.9 ....5th gear at 70 mph is 3500 rpm....and for some reaosn the calculator tells me I should be at 75 at that rpm in 5th? ..tire size is correct gearset is from an jdm sti ra ver 6


Quote:
Originally Posted by Jaxx View Post

fwiw its 3200 rpm at 70


edit 2: those are the wrong rations and don't confuse sti with stiRA there are no rules with the v2-v4 RAs they were all built to order custom
correct ratios:
TY752VBCAA 3.166 1.882 1.296 0.972 0.738 4.444
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